Two of John Grün's thick handle (around 70 mm) Dumbells. Weighing around 49 kg and 45 kg. The handles are rotating. Note the two the two block weight. They weighs around 32 kg/each.

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Arne Persson after a 10 hard seconds of holding. The floor was very expensive.

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The two blockweights put together. Grün was able to clean and lift the weights over the head. An incredible feat! It was totally impossible for me to move the weight. Probably this was Marx's challenge weight? The distance between the handles was 70 mm. Note the block of lead on the bottom of the weights.